Question

The combustion of ethanol, C2H5OH(l), in oxygen to form carbon dioxide gas and water vapor is shown by which balanced chemical equation?
A) C2H5OH(l) + O2(g) → CO2(g) + H2O(g)
B) C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g)
C) 2CO2(g) + 3O2(g) → C2H5OH(l) + 3H2O(g)
D) 2CO2(g) + 3H2O(g) → C2H5OH(l) + 3O2(g)

Answer 1

Answer:

B

Explanation:

The last 2 answers can immediately be cancelled out as they're not combustion of ethanol, combustion in this context is not a reversable reaction so cannot be referenced in this way.

The answer is determined to be B just by simply counting the numbers of each of the elements on the reactants (left) side and the products (right) side and ensuring they're the same

In A on the reactants side there is 2C 6H 3O and on the products side there is 1C 3O and 2H its not equal so it is not correct

In B on the reactants side there is 2C 6H 7O and on the products side there is 2C 6H 7O its equal so this answer is correct

Answer 2

Answer:

BBBBBBBB!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Explanation: